Oxidative balance in macroalgae from Antarctic waters. Possible role of Fe

PAULA MARIELA GONZÁLEZ ; DOLORES DEREGIBUS ; GABRIELA MALANGA ; GABRIELA LAURA CAMPANA ; KATHARINA ZACHER ; MARÍA LILIANA QUARTINO ; SUSANA PUNTARULO

JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2017 vol. 486 p. 379 - 386

0022-0981

The hypothesis of thiswork was that exposure to diverse abiotic factors in two sites with different sediment andiron input (Peñón de Pesca: lowimpact; Island D: high impact, both areas in Potter Cove, King George Island, Antarctica)affects the physiological and oxidative profile of Gigartina skottsbergii and Himantothallus grandifolius.Daily metabolic carbon balance was significantly lower in both macroalgae from Island D compared to Peñónde Pesca. Lipid radical (LR?) contentwas significantly higher in G. skottsbergii collected from Island D comparedto Peñón de Pesca. In contrast, H. grandifolius showed significantly lower values in Island D compared to Peñónde Pesca. The β-carotene (β-C) content was significantly lower in G. skottsbergii from Island D compared toPeñón de Pesca, and the ratio LR?/β-C showed a 6-fold increase in Island D samples compared to Peñón dePesca. On the other hand, β-C content in H. grandifolius showed no significant differences between both areas.The LR?/β-C content ratio in this alga was significantly lower (26%) in Island D as compared to Peñón de Pesca.Total iron content was significantly higher in both macroalgae from Island D compared to samples from Peñónde Pesca. Results with G. skottsbergii suggested changes in the oxidative cellular balance, probably related tothe higher environmental iron in Island D as compared to Peñón de Pesca. The species H. grandifolius seems tobe better adapted to the environmental conditions especially through a higher antioxidant capacity to copewith oxidative stress.